In situ observation of tricalcium aluminate dissolution in water
Shaoxiong Ye (Southeast University, China)
Pan Feng (Southeast University, China - State Key laboratory of High Performance Civil Engineering Materials, China)
Yao Liu (Southeast University, China)
Jiaping Liu (Southeast University, China - State Key laboratory of High Performance Civil Engineering Materials, China)
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Abstract
The nanoscale dissolution flux of tricalcium aluminate (C3A) in flowing water is characterized in situ by Digital Holographic Microscopy (DHM). The pure dissolution of C3A in flowing water with a flow rate of 34 ml·min-1 before the precipitation of hydrated phases only lasted about one quarter of a second, and the pure dissolution rate mostly falls in the range of 500 ~ 1500 μmol·m-2·s-1. Subsequently, foil shape hydration product formed and rapidly covered the surface of C3A, leading to the dramatic decrease of the overall dissolution rate to 55 ± 10 μmol·m-2·s-1.